Water and Sewerage Authority officials have issued a warning after blue green algae was discovered in the Clypse Reservoir.
Although algal blooms aren’t always harmful, say some can be toxic and visitors to the reservoir are advised to avoid contact with the water.
Pet owners are also being urged not to allow their animals to drink from it.
Isle of Man population edges upward to 84,975 as migration drives growth
Report shows early-career exodus persists while young families and health sector workers bolster numbers
More services to be temporarily relocated from Ramsey and District Cottage Hospital
Manx Care says it's due to an ongoing pest control problem
MAIB investigation into fatality aboard Manx registered bulk carrier
A crewman died after going overboard
Friday evening sailings subject to possible disruption or cancellation
A final decision will be made by the master by 9am on Friday morning
